Indiscriminate use of raw materials by various industries such as polymers from petroleum has been causing an ever-increasing accumulation of slow biodegrading residue materials in sanitary pits. Many modern life utensils are made out of conventional plastic that are estimated to take up to half a century to decompose. In view of this situation, the study of polymers from renewable sources, the biopolymers, is key in the search for alternatives that may decrease the damaging effects on the environment. Petroleum based polymers can in many instances be replaced by biopolymers. Amongst such products, research has been indicating that toothbrush manufacturing can make use of alternative materials. A toothbrush is a personal hygiene device that should be used for relatively short periods. It is commonly made out of polypropylene (PP), a polymer with slow biodegrading characteristics. This study uses a multidisciplinary approach and its objective is the development of a toothbrush handle made out of polyurethane derived from castor oil. Water and artificial saliva absorption, DMTA and traction experiments were carried out to compare chemical and mechanical properties of traditional polypropylene and castor oil polyurethane toothbrushes. From the tests we can conclude that the derivative of castor oil PU showed absorption of saliva superior to water and also superior to PP. With respect to traction, the PP over the PU in all aspects and is a material more resistant and more rigid. However, it was concluded that with some changes in design, a brush made of PU derivative of castor oil might reach the same tensile strength and structural rigidity of a conventional toothbrush.